/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraComponent.h
Find the value of an overridden parameter. The value returned may not be the current value being used by the simulation but will reflect the last value which has been set through the editor on a component placed in a level, or on a component in the blueprint editor. Returns null if the parameter isn't overridden by this component.
[FNiagaraVariant](API\Plugins\Niagara\FNiagaraVariant) FindParameterOverride ( const [FNiagaraVariableBase](API\Plugins\Niagara\FNiagaraVariableBase) & InKey ) const